如何将JPanel与其组件一起保存为JPEG

Question

I need to save a chessboard as a jpeg file. I know how to save a java component into JPEG. But my problem is that I use JButtons as cells and when I try to save the whole chessboard, only the panel is saved. Does anybody know how to save a JComponent WITH ITS CHILD COMPNENTS into JPEG (png etc.) Thank you in advance.

Answer 1

You can print a Component (such as JPanel ) to any Graphics object. So, why not use the Graphics object of a BufferedImage and write it to disk.

void takePicture(JPanel panel) {
    BufferedImage img = new BufferedImage(panel.getWidth(), panel.getHeight(), BufferedImage.TYPE_INT_RGB);
    panel.print(img.getGraphics()); // or: panel.printAll(...);
    try {
        ImageIO.write(img, "jpg", new File("panel.jpg"));
    }
    catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

This makes this JPanel

    JPanel panel = new JPanel();
    panel.add(new JButton("Hello"));
    panel.add(new JButton("World"));

Look like this:

updated based on comments, many thanks to @MadProgrammer

Answer 2

Check out Screen Image . It will allow you to create an image of any component in the frame. If you choose to make an image of a panel all the child components are included in the image.

Answer 3

Use Robot class to create a screen capture of your screen.

Use this tutorial for help: Screen Capture using Robot class

Now for your chessboard, clip the image by calling subImage method of BufferedImage class.

Here's the link on clipping BufferedImage

You can get Dimensions of you JPanel by calling getX(), getY(), getWidth() and getHeight() methods which you can pass into subImage method. Manipulate the passing value by adding/substracting some value to get desired results.